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Active Transport. Active Transport. Defined : Molecules move from a LOW to a HIGH concentration ATP energy needed to fight diffusion ATP = Adenosine Triphosphate ATP activates pumps (see animation). Contractile vacuole of a Paramecium.
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Active Transport • Defined: Molecules move from a LOW to a HIGH concentration • ATP energy needed to fight diffusion • ATP = Adenosine Triphosphate • ATP activates pumps (see animation)
Contractile vacuole of a Paramecium As water enters this cell by diffusion, it is immediately pumped out to prevent bursting
Endocytosis • Endocytosis: Process in which the plasma membrane takes in substances (2 types) • 1) Phagocytosis: when a cell engulfs a solid particle • 2) Pinocytosis: when a cell engulfs a liquid particle • Unfortunately, viruses can also enter our cells this way
Endocytosis & the lysosome The bacteria is engulfed by phagocytosis The bacteria is placed inside a lysosome are destroyed
Exocytosis • Defined: Process when substances are expelled from the cell • Proteins, nutrients, and waste exit by exocytosis • Vesicle carry & release objects through the plasma membrane
REview • How are active and passive transport different? • Which molecule powers active transport? • How are endo- and exocytosis similar? Different? • Which cell part controls active transport?